Plegadis is a bird genus in the family Threskiornithidae. The genus name derives from Ancient Greek plegados meaning "sickle", referring to the distinctive shape of the bill.

1/ Glossy ibis (Quắm đen, Plegadis falcinellus)
The scientific name derives from Ancient Greek plegados and Latin, falcis, both meaning "sickle", referring to the distinctive shape of the bill.